Benzoxazolon arsine oxides



Fatented July 12, 1927.

'UNl'rEns'rAT-Es PATE T OFFICE.

LUDW'IG IBENDA,

OF FECI'IENHEIM, NEAR FRAN I. G. FABBENINDUSTRIE AKTIENGESELLSOHAFE,

No Drawing". Ap

We have found that by or IYIAINKUR, NEAR FEANKFORT-ON-THE-MAIN, AND o'r'ro srnvnas, KFOET-ON-THE-MAIN, GERMANY, ASSIGNORS To A ooRronA'rIoN or GERMANY.

BENZOXAZOLON ARSINE OXIDES.

plicaticn filed June 19, 1925, Serial No. 38,328, andin Germany June 25, 1924.

gently reducing the benzoxazolon arsenic acids disclosed in Patent No. 1,545,5 1 corresponding arsine oxides 0 formula xazolon ring.

4 of June 23, 1925, the t the general maybe obtained without splitting the benzodes show valuable ties in spirochaetze, which is all the more surprising as none of the arsine oxides hither medical use.

to known is of any 200 9,1. benzoxazolon arsenic acid are dissolved at about acid ten times normal.

1200 cc. water.

diluted with 1000 cc. hydrochloric The solution is A solution of 4-0 gr. potassium iodide in 400 cc. water is then added, whereby of the new product tion assumes a dark color (iodine).

then passed in for ment and the liquor becomes The precipitate is then dec washed well with 1000 cc. sodium carbonate so soda solution, filtered, zoxazolon arsine OX1 a partial precipitation takes place and the soluseveral hours water,

by suction, It is then S0 is the sedidiscolored. anted by suction, mixed cold with lution double and again dissolved in 1500 cc. normal caustic filtrate with normal hydrochloric acid as white powder tion, washed with wa and dried at a low The new compound bei temperature.

zoxazolon-(S-arsine oxide of the formula:

and the pure bende precipitated from the it is then decanted bysucter, alcohol and ether,

ng probably bencontrast to the parent, 1

soluble in is only very span a solution 0 ngly soluble in a co naterial it is also in- 1' sodium acetate; it ld acid ten times normal.

sodium carbonate solution; dissolving very readily in a hot sodium carbonate solution, and also in a cold normal caustic soda solution. I I

The determination of arsenic yielded the following result: Precipitated 33% As. Corrected 33.3% As.

"Ewample 2.

7 After decanting by suction and washing with I water and colddilute sodium carbonate solution the 5-methylbenzoXazolon-6-arsine oxide of the probable formula:

forms a colourless powder which for further precipitation may be redissolved from ncaustic soda solution, as it dissolves readily in cold caustic sodasolution and also in a hot sodium carbonate solution. cally insoluble in a cold sodium carbonate solution, sodium acetate, water, alcohol and ether. v

, E sample 3.

150 gr. benzoXazolon-5-arso1iic acid are dissolved at about 30,in- 3000 cc. hydrochloric acid decinormal. The solution is diluted with 600 cc. water. A solution of 30 gr. potassium iodide in 300 cc. water is then addedwhereby a partial separation of the new producttakes place, the solution assuming dark color (iodine); Sulphurous acid is then passed in for several hours; the precipitate and the liquid become discolored. The precipitate is then decanted by suction, washed with water, alcohol and ether and dried at a low temperature.

It is practi- The new compound being probably benzoxazolon-5-arsine oxide of the formula:

is hardlysoluble in water and alcohol. In contradistinction to the isomeric compound it dissolves in a solution of sodium acetate and in a cold sodium carbonate solution, in a hot sodium carbonate solution and also in cold normal caustic soda solution it dissolves easily.

Ewa-mplc ,4.

225 gr. 7-chlorobenzoxazolon-5-arsonic acid are dissolved in 1600 cc. hydrochloric acid ten times normal. The solution is diluted with 1200 cc. water and a solution of potassium iodide dissolved in 400 cc. water added. Sulphurous acid is passed into this mixture of reaction which has assumed a dark coloration until saturated, during which operation it becomes discoloured. After decanting by suction and washing with water and dilute sodium carbonate solution the 7-chlorobenzoxazolon-5-a-rsine oxide of the probable formula:

forming white powders insoluble or sparingly soluble in Water, alcohol sodium carbonate and sodium acetate solution, readily soluble in a hot sodium carbonate solution and also in a cold caustic soda solution and being sul stantially identical with the compounds obtainable by gently reducing benzoxazolon arsonic acids.

2. As new substances benZoxazolon-5-ar sine oxide bodies of the formula:

in which formula X means hydrogen, which may be replaced by a monoval-ent substituent, which compounds form white powders insoluble or sparingly soluble in water, alcohol, sodium carbonate and sodium acetate solution, readily soluble in a hot sodium carbonate solution and also in a cold caustic soda solution and being substantially identical with the compounds obtainable by gently reducing benzoxazolon arsonic acids of the formula:

SOaHz in which formula X means hydrogen, which may be replaced by a monovalent substitucut.

3. As new substance: the 7-chlorobenzoxazolon-5-arsine oxide, its formula being:

forming a white powder easily soluble in caustic alkahesand 1n ahot sodium carbonate solution, insoluble in cold sodium carbonate solution, water and alcohol, insoluble in a solution of sodium acetate.

In wltness whereof we have hereunto signed our names this fourth day of June, 1925.

LUDVVIG BENDA. OTTO SIEVERS,

iii. 

